I've heard of it. A similar thing occurred back home in South Africa where an underground coal mine caught fire. They have never been able to put it out and some areas are uninhabitable. Every now and again a new hot spot appears on the surface and starts burning. Kind of weired.

edit. Here's an interesting link on coal fires.

http://www.eoearth.org/article/Coal_fires

- Peter.

__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S